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I have a 328is 1998. I've been thinking, instead of trying to add 1-2hp here and there while spending money, maybe i should try and get her to lose a few pounds. I know I can get some weight out easily from the rear by removing the rear bench,spare(already out) remove all the carpeting and insulation from the trunk but Id also like to shave some weight from the front of the vehicle. Is there anything that can be removed without going too hardcore like pulling door panels, the dash , window regulators and such. Thanks, also id like to hear from other with the same setup as me, h&r race springs and koni adjustable shocks. I've been experiencing some understeer now that the suspension is soo stiff. Anyone else feeling this?

most comonly people get rid of their A/C, power steering, and start shifting things to the back, like the battery. Removing the Window washer fluid system, getting a CF hood. Changing seats will also remove quite a bit of weight.

With regards to your understeer problem... a front diffuser will help you a lot... I don't know who makes them, but they make massive difference.

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2006 YZF-R6, bunch of go-fast stuff

swap out your seats for some non-power, non-heated racing seats.
Swap out your wheels for some light weight racing wheels like kosei.
Get yourself a lightweight battery
swap out your exaust for something aftermarket that is much lighter

Your exhaust system is quite heavy too... a catback UUC system U muffler will save you almost 30 lbs.

A lighter battery will also save you at least 20 lbs.

Other then that you've pretty much done in the back.

In the front, the AC system is quite heavy, its about 55 lbs.

Removing the sunroof motor and replacing bolting/wealding the pannel into place will also save you some weight.

Front seats replaced with bucket seats can be also quite dramatic as they are about 70+ lbs each. You can remove over 100 lbs just by going to a sparco or other seat.

Once you take care of the big stuff, you can get more thoural and remove the sound system, speakers, amps, headunit, wiring. That will be close to 70-80 lbs.

Even the suspension can use light weight parts, e.g. using aluminum control arms. Using floating rotors also saves weight too.

Light weight wheels were also mentioned, but you can't stress enough reducing unsprung weight has at least 3-4 times the impact! E.g. going from 25lbs stock wheels to 17lbs wheels reduces each corner by 8 lbs or 32 in total. But that has the effect of reducing weight by at least 90-120 lbs when it comes to braking and acceleration. Same goes for a flywheel although its only noticeable in lower gears.